摘要
使用热色液晶测量涡轮旋转盘腔表面温度随时间的变化,即利用一维半无限大平板的非稳态导热理论求出盘面的对流换热系数。然而,该理论忽略了盘面横向温度不均的影响。针对一维平板的假设在实际工程中由于盘面温度分布而导致的横向热传导所带来的误差进行理论分析得到修正方法,在25℃下采用带宽为1℃的热色液晶进行实验,将一维平板假设计算得到的对流换热系数和修正后的对流换热系数进行对比分析。研究发现:盘面的量纲一过余温度在0.44~0.55的范围内时,使用窄幅液晶测量盘面量纲一半径为0.77~0.94的对流换热系数时,由于横向热传导而带来的误差可控制在1.5%以内。
Knowing the time at which the termochromic liquid crystal( TLC) changes color,then the heat transfer coefficient can be calculated applying the analytical solution of one-dimensional semiinfinite plate hypothesis transient heat conduction. However,this process disregards lateral-conduction error,so this paper analysis theoretically the error caused by lateral heat conduction due totemperature distribution on the surface. Also the results from one-dimensional plate hypothesis and the corrected results are compared and analyzed. When the non-dimensional excess temperature ranges between 0. 44 and 0. 55,and using narrow band TLC to measure the heat transfer coefficient on the disk between non-dimension radius of 0. 77 ~ 0. 94,the error due to lateral heat conduction would be controlled within 1. 5%.
出处
《重庆理工大学学报（自然科学）》
CAS
2017年第11期94-101,共8页
Journal of Chongqing University of Technology：Natural Science
基金
国家自然科学基金资助项目(50806004)
关键词
热色液晶
瞬态实验
旋转盘腔
横向热传导
误差
thermochromic liquid crystal
transient experiment
rotating cavity
lateral conduction
error
